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nfqws: fix crash on rdata_payload=NULL

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bol-van 2024-09-18 08:33:21 +03:00
parent 85de6fc3a7
commit d951b99bd8
12 changed files with 23 additions and 12 deletions
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nfq/desync.c
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@ -921,9 +921,6 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
}
}
reasm_orig_cancel(ctrack);
rdata_payload=NULL;
if (ctrack && ctrack->req_seq_finalized)
{
uint32_t dseq = ctrack->seq_last - ctrack->req_seq_end;
@ -943,13 +940,18 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
if (!ctrack_replay->hostname)
{
DLOG_ERR("hostname dup : out of memory");
reasm_orig_cancel(ctrack);
return verdict;
}
DLOG("we have hostname now. searching desync profile again.\n");
struct desync_profile *dp_prev = dp;
dp = ctrack_replay->dp = dp_find(&params.desync_profiles, !!ip6hdr, ntohs(bReverse ? tcphdr->th_sport : tcphdr->th_dport), 0, ctrack_replay->hostname, &ctrack_replay->bCheckDone, &ctrack_replay->bCheckResult, &ctrack_replay->bCheckExcluded);
ctrack_replay->dp_search_complete = true;
if (!dp) return verdict;
if (!dp)
{
reasm_orig_cancel(ctrack);
return verdict;
}
if (dp!=dp_prev)
{
DLOG("desync profile changed by revealed hostname !\n");
@ -957,7 +959,11 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
if (!replay)
{
maybe_cutoff(ctrack, IPPROTO_TCP);
if (!process_desync_interval(dp, ctrack)) return verdict;
if (!process_desync_interval(dp, ctrack))
{
reasm_orig_cancel(ctrack);
return verdict;
}
}
}
}
@ -980,17 +986,12 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
ctrack_stop_retrans_counter(ctrack_replay);
}
DLOG("not applying tampering to this request\n");
reasm_orig_cancel(ctrack);
return verdict;
}
}
}
if (l7proto==UNKNOWN)
{
if (!dp->desync_any_proto) return verdict;
DLOG("applying tampering to unknown protocol\n");
}
// desync profile may have changed after hostname was revealed
switch(l7proto)
{
@ -1010,8 +1011,18 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
split_pos=dp->desync_split_pos;
break;
}
ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (ip6hdr ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
// we do not need reasm buffer anymore
reasm_orig_cancel(ctrack);
rdata_payload=NULL;
if (l7proto==UNKNOWN)
{
if (!dp->desync_any_proto) return verdict;
DLOG("applying tampering to unknown protocol\n");
}
ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (ip6hdr ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
if (bIsHttp && (dp->hostcase || dp->hostnospace || dp->domcase) && (phost = (uint8_t*)memmem(data_payload, len_payload, "\r\nHost: ", 8)))
{